Brake



April 2, 1935. LE RQY H HOFFER 1,996,724

' BRAKE Filed June' 1e, 19:50 2 sheets-sheet 1 Snom/Uro?,

@513% @Mime/136 Patented pr.2, 19351K. Y' l. l

Le Roy ILI. Hoffergf Brooklyn,A Yffassignor" tofilrlegopolitan Engineering Company, Brooklyn, l

Application-.lune 16, 1930, Serial No. 461,306 v 'i' eelaims. (01.138478) .This invention relates to la brake'and more wheelnl or arranged in such a manner'asfto particularlylto a brake' for motor vehicles. T apply a Vbalanced pressure tothe brake Vdrum(V Objects ofthe invention are to-provide a brake Thebrake bands 2l are each supported by a pair' and a brake mechanism `that enables the braking of links `22 each'of which is secured at its outer p 5 effect tobe easilyapplied andgmaintainedgto end to a pinv 23 that is inserted in a loop2l 5' provide a brake vmechanism -by `,which uniformformed onv the inner surface' of the brakefb'andy brake pressure may-'be applied; throughoutV the 29; The loops-24 are spaced.'circurnferentiallyL braking surfaces and to provide'ay brake r'nec-ha-` so that when the ends of lth'e'links 22 are forced a nism in which` the braking pressure may beV uni-A outwardly the; brake bands` v20 will be uniformly f formly balanced throughout the surface of the pressed 'fagainstleachl of the rotatingV brake flanges 10i* brake drum. With these and other objectsin I 5' and willaccommodateftheir lsurfaces tothe .View Whichwill more fullyappearfromthe folfla'ngeiv The links v22qare securedv at alpoint'inl. lowing description, the invention comprises .the termediate their -lengths'in theiixed or stationary:`V brake and the braking mechanism a's'f described plate- Il by means of a yoke'25 that'encloses the.

in the following specification and claims;` respectivelinks4 22` and isisecured toi the plate I1 15 l Various features of theinvention are illustrated by means fof nuts? 25. The 'innen` ends of the in the accompanying drawings, in which-'- links 22-'are`se`curedlby means ofpins-Z'ivto an Fig. 1 is a front or facefviewof a wheel'and'a actuating member or ring V28 fthat is rotatably brake embodying the .preferred form of the inmounted in a groove on theV stationaryhub' ISV a vention, a partbeingbroken-away to show.A porand is secured-inV position thereon `by means of 20%,y

tions :of the brake mechanism in section;- a retaining ring 29. The actuating-member for Y Fig. 2z is a sectional view taken` longitudinally ring 28 maybe shifted to angular,positionson r of the axis of the wheel; v -Q the'hub :I9 by means' of an'arm that'eitendsl Fig. 3 is a detailed sectional view of a Yportion sidewise through an opening 3i inthe brakeV ,25 of' the brake mechanism "taken ontheline y3-'-3. plate l1 and issecured at its' outer end .to alinkf25l Y i 40 brake drum. The brake drum rotates with 'the V0f the-rotationdf:the=brakedrumange` ifi-011140 r' Y 1 t 32 connected to the brakepedal of the vehicle. Fig. 4`is a detailedy'sectional 'View of apart of A When the vlink 32 isipulled in the direction of the? brake mechanism taken on theline 4-4 of 4the'arrow inFig. 1 it shiftsthevactuating member f Fig. 2. Y f V28 in a clock-wisedirection therebyV turning the 30- The' brake mechanism of the present invention links 22 in th-yoke 25 als a Divot tOalOOSiiGn mOre 30f may be applied to any suitabletype' of wheel." In nearlyapproaching a radial'position. This serves the embodiment shown 4inthe accompanying to'force the brake vbandsfzil outwardly.-.The* drawings,the brake isV illustrated `as applied to effect of thismovernent of the links 22 is to createV 1 f a wheel I0 mounted on a'rotatingraxle Il and pressure in the `nature cfa togglethus exerting l 35 keyed thereto by means'ofa key I2. The wheel afprop'ortionately greatfor'ceon the brakebands-35- I0 is secured to theaXlel by means of anut I3.1 20. VThe Outward inclination fth'V links 22`1f10mf The brake drum I4 is secured to the wheel l0 byv a radial direction. is 'prar'ztically` opposite to'fthe n means of bolts or rivets l5 and 'has an annular direction'of rotationofjthewheell@ lasinjdicated :ange I6 that iforms the braking surface of the,` by thearrow'fin Fig. 1; so that the frictionaleifect f1 ofFig. `1, andv i Wheel lll and'in close proximityto a 'stationary the Vbrake banclsZllis'to tend to move the latter inf@ plate I1 that is bolted or secured to the axle such a direction asto rotatethe links 22 Atowards housing. |3 and has a, hub I9 within which the a radial positionfand thus increase the pressure. j l axle `Il4 is rotatably supported. A number ofY This facilitates the application and maintenance" f 45 brake bands 2n are positioned adjacent the'inner of the braking pressure although the action ofthe V45 if surfaceA of the iiange I ly of the Y"rotating brake Vy0ke25`0f the actuating memberZB is such as toi drum and mounted in'suchga wayV that they mayV prevent an undue actionV of this natureand tot bemoved outwardly'to bring Vthe friction sur-v maintain ftheapplication of 'tlfiebrakilfig'plSSlilf` faces 2| on the outer surface of the brake bands always under JYIIBKGOIIJIOT 0f 'the' driver." Y `f -v tightly against vthe inner surface of Vthe ange Through Vtheabove inventionalsov thebrjakef50'-` n I6. Any suitable numb'erof brake bands .20.may bands'ZU are moved outwardly 'uniformlyat two be employed, four being shown 'in Ithe accompointsso that the braking pressure maybe made panying drawings by way of illustration. Y ,uniformA throughout Vthe entire surface ofthe It is preferred `also to haveV the brake bands brake band, thus providing a more uniformwear Y. Y arranged symmetrically-about the axis of the and ay more effectivebraking action. f 55 What I1claimis:- L Y Y, v1. A brake which comprises a brake drumv ro- Vtatable Vwith .a.wheel, a brake handhaving an arcuate surface to engage the surface of said brake drum, an actuating member movable angularly of the axis of said b rake drum, linksinclined from saidactuatingmember in a direction opposite to the rotation of .said vbrake drum.to-said Vbrake band, `means rfor holding said linksat a fulcrum .point.between said band and said actuating member against rotation about the axis of said drum While Vpermitting longitudinal sliding movement' wherebysaid links swing about said fulcrum pointY toward a radialposition assaidactuatingmemby Said links.

ber rotates vcounter to the direction ofrotation of saidV WheeLsaid brake bands being supported Y2. Abrake mechanism for Vehicle wheels which bands, saidlinksbeing inclined from said .actuating member inadirection opposite to the rotation of.V saidjbrake drum and means for holding said links at Ta fulcrumj point between said brake bands and: said-ring. against rotation aboutvthe axis ofsaid drumwhile permitting sliding movement lon--l gitudinallyof said' links whereby said linksjswingv about said fulcrum point towardfa radial position as said-actuatingmembenrotates counter tothe rotation of said Wheel,saidbrake,bandsbeingsup,t `ported bysaid links.f v

3. A brake mechanismfor vehicle Wheels which comprises a brakedrumfhavin'g ari-annular braking surface, segmental brake bands fitting said annular braking ,surfaceflinks connected at oneV Y. end to saidjbrakelbandsand extending inwardly at yan. angle to the radiusnof saidbrake band,

means `for holding-saidlinks at a fulcrum point between said band and.; the innerend of saidL link against rotationfabout'theaxis of saidl drum While permitting a` slidingmoyement longitudinally of lsaid links, and rfieans'acting` on the inner ends of said links for tiltingthem aboutsaid pivotal-pointy .said brake band being-.held against rotation about 1 the axis of Asaid drum solely at saidfulcrumpoints.

4; Abrake mechanismfor vehicle Wheels .which comprises ya rotatingbrakedrum having an' annu-,j lar braking' surface,` segmental brakebandsgt j tinggsaidannular. braking-surface, Va pair of links for each of saidbrake bands onelend oteach link of said .pair being connected toysaid. brakeband i f ata circumferentialjdistance'frornv the other, an l inneijr'annularV member movable relatively` togsaid brake bands and .means fior.. holding said links V at as fulcrum point between z said brake bands.

, and. said inner annular. member. against rotation about thev axisof. saiddrum VWhile permittingthe sliding movement longitudinallyg-off said .rlinks point toward or vfrom a lradial ,position4 as' saidy actuating member rotates in one direction `-or the j other,-said brakeiband beingfneld :against rotation about theaxisof said .drum'solelyv-at s aid'flulf I f .tuated members,.said links. supporting said actuated members A for radial fand circumferential cruin points.

15.... A brake mechanism '1,996,724 k' Vfitting said annular braking surface, each of said' for vemeief wheels v -mitin comprises a rrotating lbraka drum V`having anA an-, vnular .braking surface, A segmental .brake bands brake-bands'having a pair of links connected thereto at longitudinally spaced points, an inner actuating member secured to said links centrally of said brake bands and means for pivotally'holding said links intermediate their ends againstV rotation about theaxisiof the drum while permitting sliding movement longitudinally of said links whereby said links may swing aboutsaid pivotal point as said inner actuating member is rotated in one direction or the other .about the axis of "said brake' drum, said brake 'band being held against rotation about the axis of said drum solely at said .fulcrum points.

' 16. Abrake mechanism for vehicle wheels which 'comprises a brake drum having an annular inner braking surface, segmental brakev bands tting said annular braking surface, links connected at rone end to said bands, securing means fixed to axis o f{said,brake drum, said brake :band being held against rotationabout; the axis or `saiddrum solely-,iat said ffulcrurn points. i g i f 7.y In adevice ofthe vclass. described,the rcom-j bination of adrumga support member, a plurality" @ofy segmentalfshcescoacting"with said drutn and t free to ,11`^ioye` radially and circumferentiallyl with respectj thereto, anactuating member rotatably. mountedon rsaid support,.links piyotally mounted onsaid-supportv and pivotallyconnected to, said shoes and gto'said .actuating member,`said links supporting said shoes for, radial and circumferential movement, and.V means fori rotating saidac-i, tuating` membeni, the pivotal connection for .said links tosaid shoes andto said actuatingmemberj being `at all y-tirnes on opposite .sides of the radial planes of the pivots for SaidJinks to said support.k I S. vIn a. devicev of; the Vclass described, :the combnatqnfpf y a Supportrneiilber. plurality-.0f ace, tuated members free forradial and circumferential -movement,. an actuating dmember rotatably mounted en said support, .links pivotally and slid.-` ably mounted on said'support and piVotallycon-u nectedtosaid actuated members and tosaidgac-4 'said-actuated' membersbeing atall times-` on op- Vposite sides of. theradial 'planes of "the pivots for said links'vt'osaid support. A Y 9. In a .mechanism of vthe class described,the combination oi asupport member, actuated mem? bersv free for radial and;circumierential4 moveon said support member,l means for'actuating saidl 'ably .mounted on said support-fand pivotally. con-I necte'dr to said actuating member'and to said'ac'-,V l

ment V'an actuating member 4rotatably;mounted actuating member, and, linkspivotally andslid?" 

